SpringBoot整合MyBatisPlus

SpringBoot整合MyBatisPlus

1、引入pom依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.5.12</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <groupId>cn.vantee</groupId>
    <artifactId>SpringBoot_MyBatis_MySQL</artifactId>
    <version>1.0.0</version>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <dependencies>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.5.1</version>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.20</version>
            <optional>true</optional>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13.2</version>
            <scope>test</scope>
        </dependency>

    </dependencies>

</project>

2、配置yml文件

# 配置数据库链接信息
spring:
  datasource:
    url: jdbc:mysql://101.200.84.8:3306/giao?useUnicode=true&characterEncoding=UTF-8
    driver-class-name: com.mysql.cj.jdbc.Driver
    username: giao
    password: SzGDjjsi8NpJrw5t
    type: com.zaxxer.hikari.HikariDataSource
    hikari:
      minimum-idle: 5
      connection-test-query: SELECT 1 FROM DUAL
      maximum-pool-size: 20
      auto-commit: true
      idle-timeout: 30000
      pool-name: SpringBootDemoHikariCP
      max-lifetime: 60000
      connection-timeout: 30000
mybatis-plus:
  configuration:
    # 驼峰转下划线
    map-underscore-to-camel-case: true
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
  # mapper目录 这里需要注意，用classpath可能会出现
  mapper-locations: classpath*:mapper/**/*Mapper.xml
  # 别名
  typeAliasesPackage: cn.vantee.**.entity
logging:
  level:
    root: info
    cn.vantee: debug

3、实体类

package cn.vantee.core.entity;

import lombok.Data;

import java.io.Serializable;
import java.time.LocalDateTime;

/**
 * ;
 * @author : http://www.chiner.pro
 * @date : 2022-5-8
 */
@Data
public class Student implements Serializable,Cloneable{

    /**  */
    private String sId ;
    /**  */
    private String sName ;
    /**  */
    private LocalDateTime sBirth ;
    /**  */
    private String sSex ;


}

4、Mapper接口

package cn.vantee.core.mapper;

import cn.vantee.core.entity.Student;
import org.apache.ibatis.annotations.Mapper;

/**
 * ;(STUDENT)表数据库访问层
 * @author : http://www.chiner.pro
 * @date : 2022-5-8
 */
@Mapper
public interface StudentMapper {

    Student findStudentById(String id);

}

5、Mapper.xml

这里需要注意：MySQL的表名称区分大小写

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="cn.vantee.core.mapper.StudentMapper">

    <select id="findStudentById" resultType="cn.vantee.core.entity.Student">
        select * from Student where s_id = #{id}
    </select>

</mapper>

6、测试类

package cn.vantee.test;

import cn.vantee.core.entity.Student;
import cn.vantee.core.mapper.StudentMapper;
import lombok.extern.slf4j.Slf4j;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import javax.annotation.Resource;

/**
 * @author ：rayfoo@qq.com
 * @date ：Created in 2022/5/8 15:41
 * @description：测试类
 * @modified By：
 * @version: 1.0.0
 */
@Slf4j
@SpringBootTest
@RunWith(SpringRunner.class)
public class ApplicationTest {

    @Resource
    public StudentMapper studentMapper;

    @Test
    public void test() {
        Student studentById = studentMapper.findStudentById("01");
        log.info(studentById.toString());
    }

}